Plaster board



Aug. 5. 1924. 11,503,783

c. F. DAHLBERG PLASTER BOARD Filed Oct. 28, 1922 awww@ atari.

CARL FDAHLBERG, OF NEW ORLEANS, LOUISINA.

irnas'raa nonni).

vApplication led October 2.8, 1922. Serial No. 597,677.

' To all whom it may concern:

Be it known that LCARL F. DAHLBERG, a citizen of the United States, residing at New Orleans, in lthe parish of Orleans and State of Louisiana, have invented certain new and useful Improvements'in Plaster Boards; and I do hereby declare the following to be a full, clear, and exact de-l scription of the invention, such .as will enable others skilled in the art to which it appertains t0 make and use the same.

This invention relates to plaster boards and has for its object to rovide a device of this'nature which will simple in construction, comparatively inexpensive to manufacture, and more eiiicient in use than those heretofore proposed.

With these and other objects in view the.I

invention consists in the n-ovel details of construction and combinations of partsv YFigure 3 is a sectional view taken on` the line of Figure 1, lookingin the direction of the arrows;

Figure 4 is a sectional view of the board shown in Figure 2, when attached to the wall of a building;

Figure 5 is a sectional view of' a board of the kind shown in Figures 1 and 3, with its two members held together by a plastic coating material; Y

Figure 6 is an enlarged sectional View of a board similarl to that shown in Figure 5, with its members individually coated with a plastic material and held by a like material; and f Figure 7 is a perspective view of acompleted board section adapted to overlap with one or more similar sections.

In order that the precise invention may be the more clearly understood it is said?- It is now well known that 'a fibrous heat insulating wall board known on the market as Celotex is usually produced in lengths of say six to ten feet and in widths of say four feet although any other dimensions may be had if desired. This board constitutes a material of great utility7 in the making of inside as well as outside walls of buildings, and for Vmany other purposes. When used as the walls of buildings it lmay beattached directly to the studding or to the sheathingand plaster 0r .stucco applied thereto.' But, when stucco is used and sometimes when plaster is used, it is desirable to provide abetter means for bonding or securing the same to the board than is aorded by the continuous fibrous outer surfaces of the same; and in most cases it fis desirable to prevent moisture from entering and collecting in the porous interiors of these boards.

These said Celotex boards are made from partially cooked fibres of bagasse from which the incrustin material has been removed and these fi res are found in the finished boa-rd, to be of a threadlike formof varying lengths and sizes. They also retain their individuality in so far as Hex'- ibility and strength are concerned. They' are thus in marked contrast to the libres found in other boards made from bagasse wherein the chemical treatment has more or less broken down the individual fibres into a colloid like mass.

These said Celotex thread like fibres in the finished board are interlaced Ywith each other into a coherent mass which is permeated with interstices serving to entrain abnormal quantities of air. These interstices give to the board' as a whole an abnormal heat insulating capacity, and render the same peculiarly valuable for the covering and lining -of the walls of buildings in both hot and cold climates and for other purposes. It therefore'becomes an important matter to bond stucco and plaster to these boards in an inexpensive and satisfactory manner.

This problem has been solved by this invention as will now be disclosed. y

Referring to Figures 1 and 3 of the drawings, 1 indicates a fibrous Celotex board,

made from partially cooked bagasse fibres los 1n the board.

1 or 11 is secured byfany suitable means to a second brous bagasse or other board 3. The-'securing means in Fi res 1 and 3 are illustrated as staples 4, w ile in Figures 5 and 6 the securing means is a plastic substance 5. i It is preferred to make the board 1 somewhat thinner than the board 3, as is vindicated in Figures 3, 5 and v6, and it is also preferred to make the erforations 2 tapered or undercut as is il ustrated at 6 in order to better hold the plaster, stucco In either case the moisture from the wet laster or stucco is prevented from entern the form of the invention shown in Figure 2 only the single bagasse fibre board 11 is employed, which in this instance is provided with round holes 10'extending entirely through l the board and which are bevelled or undercut as at 6 as shown. This single board 11 may be made of any desired dimensions and nailed directly to lthe sheathing v12 or other supporting base as indicated at 13, Fig. 2, or it ma be otherwise attached.

Figure 7, the base supports M -are shown at 15, as extending beyond the perforated members 1, and as forming squares or sections while the perforated .members extend beyond two edges of said sections to overlie the spaces 15 on the adjacent bases 14, to the end that a substantially continuous perforated plaster lor stucco holdin surface is provided.

In a .the forms it will be seen there is employed a yielding fibrous bagasse -material in theV making of the vperforated boards 1 and 11, so that as the stucco, laster or other material 7, sets, the boar s 11 and 1 vwill yield` suiiicientl to avoid the cracking of the applied p astio material, whichis now experienced when unyielding lath boards of wood are used. Inaddition to this, even when the building settles to a slight extent it is found the'yielding` nature of this bagasse material functions to lessen the severity of the cracking of the stucco, and plaster, and in many cases it eliminates saidcracking entirely,

The perforations 2 and 10 are conveniently made by rotary punching machines and thecoatings 8are also conveniently applied by suitable machines. In the punching operation the material is compressed as is i11- dicatedv at 20, which strengthens the oorners 21 of the perforations, and thus enables one to use'a cheaper grade of Celotex7 material for the boards 1 than for the boards 3. l

It is obvious that those skilled in the art may vary the details of construction without departing `from the spirit of the invention, and therefore, I do not wish to be limited to the oregoin disclosure except as may be required 'by t e claims.

What is claimed isz- 1. A heat insulating plaster board comprising a body portion of compressible fibrous bagasse material provided with undercut perforations, the acute edges of said perforations being formed of more greatly compressed fibers than the fibersfgof said body portion, and asupporting base'of com- "pressible brous bagasse material to which said body portion is' attached, said body portion and. said supporting. base being coated with a waterproofing material.

2. A heat insulating plaster board comprising a body member composed of compressible fibrous bagasse material provided with undercutperforations, the acute edges 'of said perforations being formed of, more greatly compressed fibers than the fibers throughout the restof said body member, and a supporting base member of 'compressible fibrous bagassee material attached to said bod member so that said'base member extends eyond an edge of said body member, said body member and said base member being each coatedwith a plastic pitchlike waterproofing material. e

3. A heat insulating plaster board comprising a body member, j composed of partially cooked com ressible'bagasse fibers, provided with un ercut perforations, the acute edges of' said perforations being formed of more greatly compressed fibers than the fibers throughout the rest of said body member, and a sup orting base member likewise vcomposed o partially cooked compressible bagasse fibers, attached to said body member so that said base member extends beyond an edge ofsaid body member, said body member and said base member being each coated with a plastic pitchlike wa-v 'l ter rooting material.

n testimony whereof I 'ax my signature.

CARL F. DAinQBERG. 

